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(A,B) Amperometric response of the immunosensor to different concentrations of HER2, from a to )1 pg/ml, 5 pg/ml, 10 pg/ml, 50 pg/ml, 100 pg/ml, 1 ng/ml, 10 ng/ml, and 100 ng/ml (B) calibration curve of the immunosensor to different concentrations of HER2.
